"We just kept seeing each other and a lot of us were intimidated by each other at first," Brook Steneck, who has lost 120 pounds so far, told InsideEdition.com. "Then we realized we were kind of focusing on the same goals."

Related: Celebrity weight-loss transformations

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Shocking celebrity weight-loss transformations

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Shocking celebrity weight-loss transformations

Mama June in 2017

The "Honey Boo Boo" star documented her weight loss journey on her very own reality show! She is now down to a size 4 -- and she looks incredible!

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Mama June in 2013

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Khloe Kardashian in 2012

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Khloe Kardashian in 2016

Hard work does pay off! The youngest Kardashian sister is obsessed with exercising and documents all her workout sessions on social media.

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Lena Dunham in 2015

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Lena Dunham in 2017

The "Girls" star lost a significant amount of weight after going on a holistic diet to help alleviate symptoms of endometriosis.

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Wendy Williams in 2012

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Wendy Williams in 2017

The TV personality revealed in 2015 that she lost 50 pounds over the course of three years with a healthy diet that doesn't include refined sugars, meat, dairy or "eating after dark." It looks like she's been committed to the strict diet. She looks better than ever in 2017!

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Ricki Lake in 2010

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Ricki Lake in 2011

The actress lost 20 pounds when she appeared on "Dancing With the Stars" in 2011.

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Jordin Sparks in 2008

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Jordin Sparks in 2017

Hard work pays off! "American Idol" alum began her weight loss journey by walking around her neighborhood and the rest was history! Her favorite workout? Zumba.

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Sara Rue in 2003

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Sara Rue in 2016

The "Rules of Engagement" star is a total fan of Jenny Craig for its simplicity. She looks incredible and totally glowing!

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Jonah Hill in 2014

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Jonah Hill in 2017

Talk about a transformation! Hill has lost weight and gained weight through the years -- depending on the movie he's working on -- but his latest transformation is absolutely jaw-dropping.

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Christina Aguilera in 2012

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Christina Aguilera in 2013

Smoke show! The songstress dropped 20 pounds over the course of one year. Doesn't she look incredible?!

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Miranda Lambert in 2012

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Miranda Lambert in 2013

The country crooner slammed critics who accused her of having weight loss surgery. She revealed that she dropped the pounds the old-fashioned way -- eating right and working out with her trainer!

(Getty)

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The group began working out together a few times a week.

"We would send motivational quotes, food, workouts, alarm clocks to wake people up in the morning, to motivate each other," said Amy-Jo Reid, who has lost 104 pounds. "If one person was feeling down or in a rut, we would motivate each other to get their butt to the gym."

Eventually, Arleen Crespo, who has lost 90 pounds, presented the idea of joining a "Tough Mudder" race, a 10 to 12 mile obstacle course.

"I told them I wanted to do the toughest one, which is the one in Vermont," Crespo said.

Quasheena Young, who has lost 108 pounds, also participated in the race in 2014, even though she considered backing out.

If it's not smothered in buttered, doused in seasoning or salt, popcorn makes for a great snack. If air-popped, the light, low-calorie snack can be a good source of fiber, without the cholesterol. Plus, it's considered a whole grain!

Celery

Calories per stalk: 6

Since celery is mostly water, the fibrous plant has been known to offer many health benefits.

A great source of calcium and vitamins, cottage cheese is a go-to snack for many looking to maintain their weight. High in protein (28 grams in 1 cup of low-fat) it's recommended highly by nutritionists and athletes. The calcium-packed snack will help you feel full as it is "associated with metabolic processes that reduce fat accumulation and accelerate fat loss," according to Authority Nutrition.

Blueberries

Calories per cup: 85

The fruit is low in saturated fat, is a great source of antioxidants and dietary fiber -- and thus, can be a healthy snack for those looking to maintain or even lose weight.

Grapefruit

With only 52 calories in half of the fruit, the citrus makes for a refreshing breakfast or snack. Packed with antioxidants, vitamins and nutrients, the fruit is known to boost metabolism and lower insulin levels -- thus, actually burning fat!

Salmon is one of the healthiest foods out there, packed with nutrients and vitamins such as vitamin D. It'll also fill you up, without making you crash.

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And on race day, the women encouraged each other every step of the way. When Crespo was intimidated by a swimming obstacle, Young was there to help.

"If it wasn't for her, I probably wouldn't have been able to do it," Crespo said. "She ended up making sure she was there to help me get out of the water."

She added: "The best part was just all of us doing it together."

The women occasionally celebrate their victories with pizza and margaritas, but then it's back to business. If they go out, they make sure they are back in the gym pushing each other the next day.

"That's helped me a lot," said Steneck. "I would be good and on track for a long time and I might fall off on myself and wouldn't have the motivation to get back on, but to have everyone as a team — we go out and celebrate together and come in and work hard too — I think that was a really good balance for me."